Drinking cup



FIG. 1 is a top and side perspective view of a drinking cup showing my new design;

FIG. 2 is a front side elevation view thereof, the back side elevation view being the same;

FIG. 3 is a right side elevation view thereof, the left side elevation view being the same;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

I claim the ornamental design for a drinking cup, as shown and described. 